# Brain Bleed After an Accident: Subdural and Epidural Hematoma A subdural or epidural hematoma is a pocket of blood that collects between the brain and the skull after a head injury. Both are types of intracranial hematoma , meaning bleeding inside the head that has clotted into a mass. ## What Is a Subdural or Epidural Hematoma After an Accident? A subdural or epidural hematoma is a pocket of blood that collects between the brain and the skull after a head injury. Both are types of [intracranial hematoma](https://www.mayoclinic.org/diseases-conditions/intracranial-hematoma/symptoms-causes/syc-20356145), meaning bleeding inside the head that has clotted into a mass. Both sit within the traumatic brain injury spectrum. The two names describe location. An epidural hematoma forms outside the dura mater, the tough outer membrane that covers the brain. A subdural hematoma forms just beneath it. The distinction matters because the layers around the brain behave differently when blood pushes into them. The layers are worth knowing before anything else, since every diagnosis and imaging report refers back to them. ### Subdural hematoma: blood between the dura and arachnoid Three membranes, together called the meninges, wrap the brain. From outside in they are the dura mater, the arachnoid mater, and the pia mater. A [subdural hematoma](https://www.nhs.uk/conditions/subdural-haematoma/) is blood that has collected between the dura and the arachnoid, in the layer just under the skull's tough inner lining and above the surface of the brain. That space is normally almost nonexistent. When a vessel tears there, the blood has room to spread across a wide area of the brain's surface rather than staying in one spot. The clot sits directly against the arachnoid, with only that thin layer between the blood and the brain tissue itself. Subdural hematomas are among the most frequent bleeds seen after head trauma, and they occur across all age groups. ### Epidural hematoma: blood between the skull and dura An [epidural hematoma](https://my.clevelandclinic.org/health/diseases/22034-epidural-hematoma) is blood that collects between the inner surface of the skull and the dura mater. The term extradural means the same thing. The dura is attached to the bone along the seams of the skull, so blood in this space tends to stay confined to a defined area rather than spreading widely. Because the epidural space is pressed up against bone, an epidural hematoma is found on the same side of the head that took the impact in most cases. The clot pushes the dura inward, and the brain beneath it is displaced. The [National Library of Medicine's StatPearls reference on epidural hematoma](https://www.ncbi.nlm.nih.gov/books/NBK518982/) classifies it as one of the true neurosurgical emergencies of head trauma. ### Brain bleed vs. concussion vs. contusion vs. subarachnoid hemorrhage A concussion is a functional injury. The brain is jolted and its chemistry and signaling are disrupted, but a standard CT scan shows no bleeding. A hematoma is a structural injury. Blood is visible on imaging and takes up physical space inside the head. A person can have both at the same time, and a concussion diagnosis does not exclude a bleed. A contusion is a bruise within the brain tissue itself, with small areas of bleeding scattered through the injured region. It sits inside the brain, not around it. A subarachnoid hemorrhage is bleeding into the space between the arachnoid and the pia, where cerebrospinal fluid circulates. That blood mixes with the fluid and spreads along the brain's folds rather than forming a single clot. Subdural and epidural hematomas differ from all three. They are collections of blood outside the brain, pressing inward on it. Subdural, epidural, and intracerebral bleeds are grouped together as intracranial hematomas based on where the blood collects. All of them are forms of traumatic intracranial hemorrhage, but the treatment and risk of each depends on the location of the blood. ### Why a hematoma becomes dangerous (mass effect and rising pressure) The adult skull is a rigid, closed box. It cannot expand to make room for anything new inside it. When blood collects between the skull and the brain, the brain has to give way. This displacement is called mass effect, and pressure on tissue that has nowhere to go is what makes a hematoma a medical emergency. As the clot grows, pressure inside the skull rises. The brain is soft and can only be compressed so far before its blood supply is squeezed off and tissue begins to die. If the pressure keeps climbing, parts of the brain can be forced downward or sideways through the openings inside the skull. That process is called herniation. Herniation compresses the brainstem, which controls breathing and heart rhythm. It leads to coma and death if the pressure is not relieved. This pathway is the mechanism behind rapid deterioration in epidural bleeding, where an arterial clot can grow fast. This is the reason a hematoma is treated as an emergency rather than as a bruise that will settle on its own. The injury is not only the bleeding itself. It is the space the blood occupies and the pressure it places on everything around it. ### Acute vs. subacute vs. chronic subdural hematoma Subdural hematomas are further classified by how long the blood has been present. An acute subdural hematoma is fresh, recently clotted blood. A subacute subdural hematoma is older blood that has begun to break down. A chronic subdural hematoma is a collection that has been present for weeks, liquefied, and often enclosed in a membrane the body forms around it. Chronic collections are more common in older adults and can follow injuries the person barely noticed. These stages are not just labels for timing. Fresh blood, breaking-down blood, and old liquid blood look different on imaging, behave differently inside the skull, and are treated differently. A chronic collection can grow slowly and produce a very different picture than an acute one. The timeline for when each stage appears after an accident is addressed later on this page. ## What Is the Difference Between a Subdural and an Epidural Hematoma? The difference between a subdural and an epidural hematoma is which side of the dura mater the blood collects on. The dura is the tough outer membrane that lines the inside of the skull and covers the brain. An epidural hematoma sits above the dura, in the space between the dura and the skull. A subdural hematoma sits below the dura, between the dura and the thin arachnoid layer that rests on the surface of the brain. ### "Epi" and "sub": above and below one membrane "Epi" means above and "sub" means below. The two names describe position relative to the dura and nothing else. An epidural collection has bone on one side and dura on the other. A subdural collection has dura on one side and the arachnoid on the other. Both names end in "hematoma," which means blood that has pooled outside a vessel. A single membrane separates the two spaces. Both are pools of blood inside a closed skull, and both take their names from that one anatomic boundary. ### Why blood stays on one side of the dura The dura is a physical barrier. Blood that escapes above it does not seep through into the space below. Blood that collects below it does not push up into the space above. A collection stays in the compartment that holds the torn vessel. The first question about any of these bleeds is which side of the dura the blood is on. The answer places the collection in one of two defined spaces before anything about the collection itself has been measured. ### What the name tells a treating team, and what it leaves out The name tells a clinician where the blood sits and which layers lie between the blood and the brain. An epidural collection lies directly under the skull with the dura still between it and the brain. A subdural collection lies under the dura, with only the arachnoid and the pia between it and the brain tissue itself. The label answers the question of location. The name does not describe how much blood has collected. Size and other findings are established by the treating team, and they do not come from the word in front of "hematoma." The type places the collection. The findings describe it. ## What Accidents Cause a Subdural or Epidural Hematoma? A subdural or epidural hematoma follows a head injury, and head injuries come from a short list of everyday events. Vehicle crashes, falls, workplace struck-by incidents, contact sports, and assaults account for most of them. The accident label matters less than the event itself: a head striking or being struck by something hard. Any of the settings below can produce that event. ### Car, truck, and motorcycle crashes In a crash, the vehicle stops or changes direction faster than the people inside it. Occupants are thrown against the steering wheel, dashboard, window, door pillar, or headrest. The seat belt restrains the torso, but the head and neck still move through the cabin until something stops them. Rear-end and head-on collisions send the head forward and back. Side impacts and rollovers push it sideways and add twisting. Motorcyclists, bicyclists, and pedestrians experience a different version of the same event: the head meets pavement, a curb, or the body of a vehicle with nothing in between. A collision between a commercial truck and a passenger car puts far more energy into the smaller vehicle. The people inside the car take the harder stop and the harder contact with the interior. A crash does not need to leave a visible scalp wound to have delivered a serious blow to the head. ### Slip-and-fall and fall-from-height head trauma A ground-level fall onto concrete, tile, asphalt, or the edge of a step delivers a focused blow to one part of the head, most often the back or side. The floor does not give, so the head absorbs the full stop. A fall that seems minor at the moment is still a head strike against a surface that does not yield. Falls from height carry more energy. Ladders, scaffolding, loading docks, roofs, and stairways all produce head impacts well beyond what a standing fall delivers. A fall down a full flight of stairs often involves several impacts in sequence, and each one adds to the total. Slips on wet floors, trips over uneven walkways, and missteps on poorly lit stairs are the ordinary versions of this mechanism. They happen at home, in stores, in parking lots, and on job sites. The setting changes, but the head-against-hard-surface event is the same. ### Sports, workplace, and blunt-force impacts Contact sports produce head blows at speed. Helmet-to-helmet contact in football, a fall onto ice in hockey, or a collision with a goalpost or hard court strikes the head and stops it at the same moment. Boxing and mixed martial arts add repeated blows, one after another, often to the side of the head. Industrial and construction settings generate blunt head trauma from falling tools, swinging loads, unguarded machinery, and vehicle strikes in yards and warehouses. A load swinging from a crane or a forklift strike delivers far more force than a dropped hand tool. Hard hats reduce some of that force but do not remove it. Assaults with fists, feet, or blunt objects produce the same kind of blow. A single punch that drops someone onto a hard surface produces two impacts: the blow itself and the head striking the ground. The second impact is often the more serious of the two. ## What Are the Symptoms of a Brain Bleed After a Head Injury? The symptoms of a traumatic brain bleed are the symptoms of rising pressure inside the skull. The bleed itself produces no sensation. What a person feels, and what the people around them see, is the brain being squeezed by a clot that has nowhere to go. The change shows up in how alert the person is, how they think and speak, how they move, and how their eyes respond. The direction of change over hours matters more than any single finding. A symptom that is present at the scene and then fades is a different problem from a symptom that appears late and keeps getting worse. People watching an injured person should be tracking the trend, not taking one snapshot. ### Immediate symptoms at the scene (acute presentation) A large, fast bleed announces itself within minutes to a few hours. Bystanders often describe someone who answers questions slowly, repeats the same question, cannot say where they are, or keeps throwing up without an obvious reason. The person may grow harder to rouse as the minutes pass. The eyes can give the clearest early clue. As a clot pushes the brain sideways, it stretches the nerve that controls the pupil on the side of the bleed. That pupil widens and stops reacting to light while the other stays normal. Weakness tends to appear on the opposite side of the body from the bleed, because the motor pathways cross before they reach the limbs. New slurred speech, a drooping face, an arm or leg that will not cooperate, or a seizure can also appear in the first hours. Emergency clinicians treat each of these after head trauma as a possible sign of bleeding until imaging shows otherwise. ### Symptoms that mimic concussion, intoxication, or being shaken up Concussion and brain bleed share their early symptoms: headache, dizziness, nausea, foggy thinking, sensitivity to light, and irritability. The separating feature is direction. Concussion symptoms tend to plateau and then ease over hours and days. Bleed symptoms escalate. A headache that is worse at hour six than at hour two, or nausea that turns into repeated vomiting, points away from simple concussion. Intoxication is a common and dangerous mimic at crash scenes. Slurred speech, unsteady walking, confusion, and drowsiness look the same whether the cause is alcohol or a clot pressing on the brain. Alcohol also dulls the person's own sense that something is wrong. Someone who has been drinking and hit their head is harder to assess by observation alone. Being "shaken up" describes the adrenaline response to a frightening event: trembling, rapid heartbeat, a dazed look, trouble concentrating. Those signs fade over an hour or two as adrenaline clears. Confusion or drowsiness that persists or deepens after the adrenaline wears off is not being shaken up. ### Symptom variants in infants, older adults, and anticoagulated patients Infants cannot report a headache. A brain bleed in a baby can show up as a bulging soft spot on the top of the head, persistent inconsolable crying, or refusal to feed. Repeated vomiting, unusual sleepiness, a high-pitched cry, and seizures are other signs. A head circumference that grows over days can signal blood or fluid accumulating. Older adults often present with subtle symptoms because age-related brain shrinkage leaves more room inside the skull for blood to collect before pressure rises. Instead of a dramatic collapse, family members may notice gradual confusion, new memory lapses, unsteady walking, falls, personality change, or reduced speech. These changes are easy to mistake for dementia, a stroke, or a urinary infection. A head bump weeks earlier may have been forgotten or dismissed as minor. People taking blood thinners such as warfarin, apixaban, rivaroxaban, or clopidogrel bleed faster and for longer once a vessel tears. Their bleeds can grow from minor trauma, including a bump against a car door frame or a fall from standing. Symptoms may appear sooner and progress faster than in someone with normal clotting. Any new headache, confusion, or drowsiness after head contact in an anticoagulated person is treated as a possible bleed until a scan proves otherwise. ## When Should You Go to the ER for a Possible Brain Bleed After an Accident? Go to the emergency room the same day after a head impact in a vehicle collision, a fall, or a blow to the head. Call 911 instead of arranging a ride if the person's condition changes at any point after the impact. The reason to go is the head impact itself, not how the person looks an hour later. Emergency physicians decide what examination and imaging a head injury calls for. They make that decision in the hospital, with the equipment and the history in front of them. It is not a decision a household makes by watching and waiting. ### Call 911 when something has changed The symptoms section above describes what a brain bleed can look like in the hours after a head injury. A change of that kind is a reason to call 911, not a reason to see whether it passes. The caller does not need to decide which change matters most or whether it is serious enough. One change is enough to make the call. The emergency team sorts out the cause once the person arrives. ### Getting to the hospital An ambulance crew observes the injured person during the trip and can begin care before arrival. If the person's condition changes on the way, the crew responds in the vehicle and alerts the receiving hospital. That is what makes 911 the better choice whenever anything has changed. When the decision is a same-day visit rather than a 911 call, a second person makes the trip as well and watches for change along the way. Note the time of anything new so the emergency team hears an accurate timeline. ### What to tell the emergency team The team's evaluation depends on a complete history. Describe the mechanism: what struck the head, how fast the vehicle was moving, how far the person fell, or what the person hit. Give the timeline from the impact forward, including any period of confusion or altered alertness, however brief. Tell the team what medications the person takes and what health conditions have been diagnosed. Bringing the bottles or a written list saves time and avoids gaps. Repeat all of it at triage, even if the EMS crew already heard it. ### The hours after discharge Written discharge instructions after a head injury describe the changes that call for a return visit and say who should stay with the person and for how long. Follow them at any hour, including the night after the visit. Keep the paperwork where the person doing the watching can find it. Return to the emergency room, or call 911, for any change the discharge paperwork describes. Do not wait until morning to see whether it passes. A change after a head injury is an emergency whenever it happens. ### Children after a head impact Children cannot always describe a headache or explain that they feel confused, so parents are watching behavior rather than hearing a report. Any change in how a child acts, eats, sleeps, moves, or responds after a head impact is a reason to go to the emergency department. That includes a child who seemed fine and then does not. Infants and toddlers are harder to read than older children. Pediatric emergency teams decide what examination and imaging a child's head injury calls for, and that decision belongs in the hospital. After a child's head injury, going is the right call whenever a parent is unsure. ## How Long After an Accident Can a Subdural Hematoma Appear? There is no single interval between a head injury and the first sign of a subdural hematoma. Symptoms can start at the scene of a crash or fall, or they can start after the person has been evaluated, sent home, and returned to daily life. The gap depends on how quickly blood collects and how the brain responds to that collection. The treating team reads that timing for each patient, and the honest general answer is that the window runs from immediate to delayed. ### Timing follows the speed of the bleeding Fast bleeding produces symptoms close to the accident. The person may not wake fully after the collision, or may seem dazed at first and then worsen while still under emergency care. This is the version most people picture when they hear the words brain bleed, and it is the version emergency teams are watching for during the first visit. Slow bleeding can sit below the threshold of notice for a stretch. The collection may enlarge over time until it produces a change the person or a family member can see. Because the pace differs from patient to patient, no calendar rule tells a reader when the risk has passed. That determination comes from the treating team's exam and follow-up plan. ### Changes to watch for after leaving the emergency department The delayed pattern often begins with a headache that builds instead of fading. Other later complaints include new trouble concentrating, unusual sleepiness, unsteady walking, a shift in personality, or weakness on one side that comes and goes. These complaints tend to arrive after the person believes the injury is behind them. A head injury that seemed to be improving and then reverses course is the pattern that should prompt a call to the treating physician. Discharge instructions list the warning signs specific to that patient. Those instructions apply for the full period the treating team considers relevant, not only the first night. The emergency red flags that call for 911 are covered in the section on when to go to the ER. ### Tell the treating team about every recent head contact The event that starts a slow-developing bleed is sometimes one the person never counted as an injury. A bumped head on a car door frame, a low-speed rear-end collision without visible bruising, or a stumble caught on the way down can all be enough. With no cut, no loss of consciousness, and no dramatic pain, the moment fades from memory. That is why a physician evaluating new neurologic symptoms asks the person to think back over any recent head contact at all. The question is part of a standard history, not a formality. Anyone with a recent crash or fall should mention it to the treating team, even if it seemed trivial at the time. Reporting the event lets the treating team decide what evaluation and follow-up fit that patient. ## How Are Subdural and Epidural Hematomas Diagnosed? A subdural or epidural hematoma is diagnosed by pairing a bedside neurologic exam with a CT scan of the head. The exam shows how the brain is working at that moment. The scan shows whether blood has collected inside the skull, which compartment holds it, and how much room it is taking from the brain. The care team reads the two together and repeats both when anything changes. ### Neurologic exam and repeated bedside checks The exam starts before any scanner is involved. Paramedics and emergency physicians check whether the patient opens their eyes, answers questions, and follows commands. Those responses are recorded on a standardized bedside scale (the [Glasgow Coma Scale](/resources/injuries/brain/glasgow-coma-scale/)) so that every clinician who sees the patient measures the same thing. Pupil size and reaction, strength in each arm and leg, speech, and orientation to person, place, and time are checked alongside it. Those findings are written down on arrival and rechecked at set intervals. A patient who becomes harder to wake, or whose pupil enlarges on one side, is showing that something inside the skull is changing. The trend matters more than any single reading. A person can be awake and conversing and still have a significant hematoma. The exam sets the urgency. Imaging settles the diagnosis. ### Head CT after trauma A CT scan of the head is the study emergency departments use to look for bleeding inside the skull after trauma. Fresh blood appears brighter than the surrounding brain tissue on the images, so the radiologist can see an acute collection and judge its size. Most hospital emergency departments have a scanner available around the clock. The same images show where the blood sits relative to the brain's coverings. Blood between the inner skull and the dura, the tough outer membrane, is an epidural hematoma. Blood beneath the dura and over the brain surface is a subdural hematoma. The radiologist also reviews the images in a bone setting to look for a skull fracture. The distinctive shapes each type takes on CT are compared in the section on the difference between the two. For the diagnosis itself, the practical point is that one scan identifies the compartment and picks up other injuries in the same pass. ### What the CT report describes The CT report describes how large the collection is and what it is doing to the brain. The radiologist measures the hematoma's greatest thickness in millimeters, or estimates its volume, and states which side of the head it occupies. The report also records whether the brain's center line has been pushed toward the opposite side, and by how many millimeters. Compression findings complete the description. The skull is a closed box, so a growing clot has nowhere to expand except into brain. On the images this appears as flattened surface folds, a squeezed fluid-filled ventricle on the affected side, and narrowed fluid spaces at the base of the brain. Those descriptions are the language the care team uses when speaking with the family. Knowing the thickness and shift numbers, and whether they changed between scans, is a concrete way to follow the patient's course. How the team acts on them is covered in the treatment section. ### When MRI, repeat CT, and labs are needed A repeat CT is ordered whenever the exam changes, and often on a set schedule even when it does not. A collection can enlarge in the hours after the first scan, so patients admitted for monitoring are commonly rescanned within the first day. Patients on blood thinners are rescanned more readily. MRI is not the study emergency teams reach for in an unstable trauma patient. It takes longer and is hard to perform on someone who is ventilated or cannot hold still. Later, it detects small subacute and chronic subdural collections that have faded on CT. It also shows [diffuse axonal injury](/resources/injuries/brain/diffuse-axonal-injury/) and contusions when symptoms are worse than the CT would predict. Blood work runs alongside imaging. A coagulation panel (PT and INR), a platelet count, and a complete blood count show whether the patient's blood can clot. The team also takes a medication history, because warfarin, newer oral anticoagulants, and antiplatelet drugs such as clopidogrel each affect how a collection behaves. ## How Is a Subdural or Epidural Hematoma Treated After an Accident? Treatment of a traumatic subdural or epidural hematoma turns on one question: does the clot need to come out now? The treating neurosurgeon answers it from the head CT and the neurologic exam, and asks it again every time either one changes. Some patients stay in the hospital under close watch. Others go to the operating room within the hour. Everything else, from reversing blood thinners to controlling pressure inside the skull, supports one of those two paths. ### Hospital monitoring with repeat exams and repeat CT scans Not every traumatic bleed is operated on. When a neurosurgeon judges a clot small enough to watch, the patient stays in the hospital and the neurologic exam is repeated on a schedule the team sets. The head CT is repeated as well, to show whether the bleed has grown, held steady, or started to fade. A clot that grows or an exam that worsens moves the plan to surgery. A stable scan and a steady exam keep the patient on the ward. Nurses check pupils, speech, and alertness through the night. The team decides when the next scan happens and when discharge is safe. Blood pressure control and holding blood thinners are part of this stage. Alcohol is avoided because it clouds the exam and raises bleeding risk. Some centers add a short course of anti-seizure medication during the first week after injury. ### Emergency surgery: craniotomy and decompressive craniectomy Surgery removes the clot and relieves pressure on the brain. The neurosurgeon weighs the CT appearance against the exam, the pupils, and whether the clot has grown on repeat imaging. That judgment belongs to the treating surgeon, for that patient, on that day, and it is revisited if the picture changes. A craniotomy is the standard operation for an acute bleed. The surgeon removes a section of skull, opens the dura when needed, suctions out the clot, controls the bleeding vessel, and replaces the bone flap. Acute clots are firm, so a full window in the skull is needed to reach them. A decompressive craniectomy is a craniotomy in which the bone flap is left off. Surgeons choose it when the brain is swollen and expected to swell further, so the skull does not trap rising pressure. The bone is stored or replaced with an implant weeks to months later once swelling has settled. ### Reversing anticoagulation and controlling intracranial pressure in the ICU A patient on a blood thinner cannot go to surgery, or be watched with confidence, while the drug is still active. Reversal starts in the emergency department, often before imaging is finished. Warfarin is reversed with vitamin K and a clotting-factor concentrate. The newer oral anticoagulants have their own reversal agents, and the hospital pharmacy protocol determines which one is used. Antiplatelet drugs such as aspirin and clopidogrel have no true antidote. The team weighs platelet transfusion case by case, since the benefit is uncertain and transfusion carries its own risks. The medication list a family gives the ER staff changes what happens in the first hour. After surgery, or during observation of a severe injury, the patient is managed in a neurologic intensive care unit. Many patients receive an intracranial pressure monitor placed through the skull. The team keeps the head elevated, maintains normal oxygen and blood pressure, and uses sedation and a breathing tube when needed to keep pressure down. If pressure rises despite those steps, the ICU uses mannitol or hypertonic saline to draw fluid out of swollen brain tissue. Temperature is controlled and fever is treated. When medical measures fail, the surgeon repeats the scan and returns to the operating room for possible decompression. ### Why time-to-evacuation matters most for epidural arterial bleeding An epidural hematoma most often comes from a torn artery, so blood fills the space between skull and dura under arterial pressure. That clot can enlarge within an hour. Because the bleeding is fast and the brain underneath is often uninjured, an epidural bleed is both the most time-sensitive and the most correctable of the traumatic bleeds. Trauma centers track the interval from arrival to skull opening for these patients. A patient who reaches the operating room while still awake, with equal pupils, has a very different course from one who arrives after a pupil has dilated. This is why an emergency department moves a suspected epidural bleed ahead of nearly everything else. It is also why transfer from a smaller hospital to a neurosurgical center is arranged by air when driving time is long. An acute subdural hematoma is also an emergency, but its bleeding source is usually venous and slower. Its severity tends to track the brain injury underneath the clot rather than the clot alone. The evacuation still needs to happen without delay. The underlying injury does not vanish when the clot is removed. ## What Is the Prognosis and Recovery Time After a Traumatic Brain Bleed? The outlook after a traumatic subdural or epidural hematoma is set for the individual patient by the neurosurgeon and the rehabilitation team, not by the name of the diagnosis. Two patients with the same diagnosis can hear very different estimates, because each estimate rests on that patient's exam, scan, and hospital course. The same is true of healing time, and there is no calendar for it. The team sets expectations for the individual and revises them at each stage, from the intensive care unit through rehabilitation and follow-up. ### Factors the treating team weighs: age, exam findings, clot size, time to surgery When a neurosurgeon discusses outlook with a family, the conversation draws on information already in the chart. The first item is the level of consciousness on arrival, recorded on the Glasgow Coma Scale. A patient who was awake and following commands is in a different position from one who arrived unresponsive, and the team says so. Age and other medical conditions are part of the same conversation, including whether the patient takes a blood thinner. The physical exam adds detail. Pupil response is checked at every neurologic assessment because it reflects how much pressure the brainstem is under. The CT adds the size and thickness of the clot, the degree of midline shift, and whether there is other injury such as contusion or swelling. When the clot is only part of the picture, the team explains that the other injuries matter too. The last item is time. The team knows how long the clot was pressing on the brain before it was relieved, and that history is part of how it frames expectations. None of these items produces a number on its own. Together they let the team describe what it expects and what it will watch for in the days ahead. ### Typical hospital course after surgery After a craniotomy for an acute clot, the patient goes to a neurosurgical intensive care unit. Nurses perform neurologic checks on a fixed schedule, often every hour at first. Some patients have an intracranial pressure monitor for the first several days. A repeat head CT within the first day confirms the clot is out and nothing new has formed. From there, the patient steps down to a regular neurosurgical floor and then to home or to inpatient rehabilitation. How long each stage lasts depends on the severity of the injury and on how the patient responds. An alert patient after an uncomplicated evacuation moves through those steps faster than a patient who arrived in coma. Burr-hole drainage for a chronic subdural is a shorter course, and a drain often stays in place for a day or two before removal. Headache, fatigue, poor sleep, slowed thinking, and irritability are common in the first weeks. Seizures can occur after surgery, and the team watches for them. A patient who had a decompressive craniectomy lives for a period without a section of skull. A later operation, called a cranioplasty, replaces the bone after the surgeon judges that swelling has resolved. ### Physical, occupational, speech, and cognitive rehabilitation Rehabilitation starts in the hospital, often within days of surgery. Physical therapy works on balance, walking, and strength, especially when the clot caused one-sided weakness. Occupational therapy targets the tasks of daily life: dressing, cooking, handwriting, and fine motor control of the hands. Speech-language pathology treats more than speech. It addresses swallowing, word-finding, reading, and the cognitive-communication problems that follow brain injury. Neuropsychology covers memory, attention, processing speed, and executive function. Testing identifies what changed and shapes the therapy plan. Some patients complete rehabilitation as inpatients in a dedicated unit. Others go home and continue as outpatients or with home health therapists. The team measures progress against the patient's own baseline, not a population average, because the pattern of deficits differs from one patient to the next. Therapy goals that seemed distant at discharge are revisited at each follow-up visit. ### Returning to work, driving, and contact sports: what "cleared" requires Clearance is a medical judgment by the treating team, not a date on a calendar. For driving, the physician weighs seizure risk, vision, reaction time, and attention. The physician often looks for a seizure-free period and, in some cases, a formal driving evaluation before approving a return to the road. Return to work is most often graduated. A patient may start part-time with reduced cognitive load and build up from there. For jobs that require sustained attention, quick decisions, or safety-sensitive tasks, [neuropsychological testing](/resources/injuries/brain/neuropsychological-testing/) often precedes full clearance. Fatigue is a frequent barrier to a full schedule early on. Return to contact sports after a surgically treated intracranial hematoma is a separate question. The surgeon weighs the consequences of a second impact to a brain that has already been operated on, and many patients are advised not to resume contact activity. Patients who had a craniectomy cannot return to contact activity before cranioplasty at the earliest, and the decision after that rests with the surgeon. ### Follow-up imaging and restarting blood thinners after discharge A repeat head CT after discharge confirms the clot has resolved and nothing has re-accumulated. Chronic subdural hematoma gets closer imaging follow-up than an acute bleed, because fluid can collect again after drainage. Patients who had a craniectomy also get imaging before cranioplasty. The surgeon sets the schedule based on the type of clot, the surgery performed, and how the patient is doing. Restarting anticoagulation is one of the harder decisions after a brain bleed. The medication was prescribed for a reason, such as atrial fibrillation, a mechanical heart valve, or a history of blood clots. Stopping it raises the risk of stroke or deep vein thrombosis. Restarting it raises the risk of bleeding again. The neurosurgeon and the prescribing physician make that call together for the individual patient. The timing depends on the size of the original clot, whether it has resolved on imaging, and how strong the reason for the medication is. There is no standard interval that applies to every patient. After discharge, new or worsening headache, increasing drowsiness, confusion, vomiting, new weakness, or a seizure are reasons to return to the emergency department. These signs can mean re-bleeding or fluid buildup, and both are treatable when caught early. ## What Are the Long-Term Effects of a Subdural or Epidural Hematoma? The long-term effects of a subdural or epidural hematoma depend on three things. The first is how much brain tissue the clot compressed. The second is how long that pressure lasted before it was relieved. The third is whether the brain beneath the clot was bruised or torn in the same impact. A small bleed drained early can leave no measurable deficit. A large bleed that shifted the brain before surgery can leave lasting cognitive and physical impairment. The effects below are the ones neurologists and rehabilitation teams evaluate in the months and years after the injury. ### Cognitive, memory, and mood impairment The most common lasting effects are cognitive. Slowed thinking, trouble holding several things in mind at once, short-term memory gaps, and word-finding difficulty are typical after a hematoma that compressed the frontal or temporal lobes. These deficits often become obvious only after the person returns to work or school and cannot keep pace with tasks that were routine before the injury. Mood and personality changes are just as common and harder to recognize. Irritability, apathy, depression, anxiety, and reduced impulse control all appear after brain injury of this kind. Family members tend to notice these changes before the injured person does. Neuropsychological testing several months after the injury is the standard way to measure these deficits and separate them from the effects of pain, medication, or poor sleep. ### Physical deficits: weakness, balance, speech, and vision A clot that pressed on the motor areas of the brain can leave weakness or clumsiness on the opposite side of the body. Some people regain most of that strength through physical therapy. Others keep a limp, a weak grip, or a drop in fine motor control that affects handwriting, buttons, and tools. Balance problems and dizziness are common when the pressure affected the brainstem or cerebellum, and they raise the risk of falls. Speech can be slurred or slow, and some patients have trouble producing or understanding language. Vision changes include double vision, loss of part of the visual field, and difficulty tracking moving objects. Occupational and speech therapists work on each of these. The deficits that remain after therapy plateaus are the ones that define daily function. ### Hydrocephalus and persistent headache Blood in the spaces around the brain can scar the pathways that absorb cerebrospinal fluid. When that happens, fluid backs up in the ventricles and produces post-traumatic hydrocephalus. It tends to appear weeks to months after the injury and causes a recognizable pattern: worsening gait, urinary urgency, and cognitive decline. Treatment usually requires a shunt to drain the excess fluid. Persistent post-traumatic headache is also common. When headache continues beyond three months, the treating team manages it as a long-lasting headache condition rather than an acute injury symptom. Patients who needed part of the skull removed to relieve pressure face a second operation to replace it. They may have pressure-related headaches or dizziness until that repair is done. ### Lasting disability and long-term care Functional outcome after a hematoma is graded on a scale that runs from full return to prior activity down to severe disability requiring daily assistance. Patients in the more severe categories often cannot return to their previous occupation. Many need help with bathing, dressing, or medication management, and depend on a caregiver for safety. Speech and cognitive therapy can still produce gains after the early period, but the pace slows and the remaining deficits become the baseline. Long-term care for these patients involves ongoing neurology follow-up, periodic imaging, and rehabilitation therapy that may continue for years. It also involves support for the family members who provide daily care. They are usually the first to notice a new or worsening headache, a change in walking, new weakness, confusion, or unusual drowsiness. Any of those changes needs prompt evaluation by the treating team. ## What Should You Do Immediately After Hitting Your Head in an Accident? Get a medical evaluation the same day, tell the clinicians exactly how your head was struck and what medications you take, and write down the timeline while it is fresh. Those three steps cover most of what matters in the first hours. Bleeding inside the skull does not always announce itself right away, so the decision to seek care should rest on the force of the impact, not on how you feel afterward. ### Seek emergency medical evaluation even if you feel fine Feeling normal after a blow to the head is not proof that nothing is bleeding. A hematoma can build slowly enough that the first hours pass without a single symptom. Anyone who lost consciousness, even for seconds, or who cannot remember the moments around the impact should be seen in an emergency department. The same applies to a crash at highway speed, a fall from a ladder or roof, or any blow hard enough to crack a helmet, windshield, or hard hat. Some people should go regardless of how minor the impact seemed. That group includes adults over 65, anyone taking a blood thinner such as warfarin, apixaban, rivaroxaban, or clopidogrel, anyone with a bleeding disorder, and heavy drinkers. Age and these medications raise the odds of a slow venous bleed after trauma that would not trouble a younger, unmedicated person. Let someone else drive; a person with a possible head injury should not be behind the wheel. ### What to tell EMS or the ER: mechanism, anticoagulants, changes in alertness Clinicians decide whether to order a head CT based in part on what you tell them, so the history matters. Describe the mechanism: what struck your head, roughly how fast, whether you were wearing a seatbelt or helmet, and whether your head hit glass, pavement, a steering wheel, or the ground. Say whether you blacked out and for how long, whether you vomited, and whether you remember the event itself. If a passenger or bystander saw you dazed, repeating questions, or slow to respond, have that person tell the staff directly. Patients are often the least reliable witnesses to their own alertness. List every medication and supplement, and name any anticoagulant or antiplatelet drug first. Bring the pill bottles or a photo of them if you can. Mention any bleeding disorder, any prior head injury or brain surgery, alcohol in the hours before the accident, and any headache that has changed since the impact. The [CDC HEADS UP program](https://www.cdc.gov/heads-up/) lists the danger signs clinicians look for, and the facts above are what let them apply that list to you. ### Document the accident and your injury Write down the timeline as soon as you are able: the time of impact, when each symptom started, and what changed and when. Photograph anything visible, including scalp swelling, cuts, bruising behind the ear, or bruising around both eyes. Note which side of the head took the blow and what it struck. A physician who sees you three days later will ask these exact questions, and the injury itself can blur memory of the event. If you cannot keep the log, ask a family member or friend to keep it for you. Have that person also note how you seemed to them over the following days: more tired than usual, slower to answer, unsteady, irritable, or confused. Changes another person notices are often the earliest sign that something is developing. ### Save ER records, imaging, and discharge instructions Ask for copies of the emergency department report, the radiologist's reading of any CT scan, and the written discharge instructions. Ask how to obtain the actual imaging files, whether on disc or through a patient portal. If a repeat scan is needed later, the radiologist compares the new images against the originals, and having them in hand avoids delay. Keep the discharge sheet in a visible place; it lists the warning signs that require an immediate return trip. Keep a single folder for everything that follows: follow-up visits, prescriptions, referrals, and any work or activity restrictions written by the treating physician. A continuous record of care helps every clinician who sees you afterward understand the course of the injury. Questions about the accident itself, rather than the injury, are addressed on the firm's brain injury practice page. ## Related Brain Injury Resources - [Brain swelling and intracranial pressure](/resources/injuries/brain/brain-swelling-intracranial-pressure/) - [Brain contusion (cerebral bruise)](/resources/injuries/brain/brain-contusion/) - [Skull fractures](/resources/injuries/brain/skull-fractures/) - [Coma and vegetative state](/resources/injuries/brain/coma-and-vegetative-state/) - [Glasgow Coma Scale](/resources/injuries/brain/glasgow-coma-scale/) - [Post-traumatic epilepsy](/resources/injuries/brain/post-traumatic-epilepsy/) ## Frequently Asked Questions ### Is a subdural hematoma always fatal? No. A subdural hematoma ranges from a thin, stable layer of blood that the body reabsorbs to a large clot that pushes the brain across the midline. Those two ends of the range have very different outcomes. Acute subdural hematomas that need emergency surgery are the most dangerous form. Surgical series of acute bleeds summarized in the StatPearls review of subdural hematoma show high death rates. Outcome tracks closely with the patient's neurologic status before surgery. Chronic subdural hematomas build up over weeks, are usually drained through small burr holes, and most patients improve afterward. The label alone does not decide the outcome. Alertness on arrival, age, and pupil response matter. So do clot thickness on CT, the degree of brain shift, and how fast the clot was relieved. ### Can a small brain bleed heal without surgery? Sometimes. A small hematoma with little or no midline shift can be observed rather than operated on if the patient is awake and neurologically stable. The body breaks down and reabsorbs the blood over weeks. Follow-up CT confirms the collection is shrinking rather than growing. Observation does not mean waiting at home. It means hospital admission, neurologic checks every few hours, and a repeat CT scan. The team operates if the clot enlarges or the exam changes. Blood thinners are held or reversed during this period. Some small bleeds do grow. The acute phase covers roughly the first 72 hours after injury, and that is the window in which enlargement most concerns the treating team. A neurosurgeon makes the decision to observe with the scan in front of them. A patient who was being watched can still need surgery the next morning. ### Can a CT miss a brain bleed right after the accident? Yes, in specific situations. Non-contrast head CT is the first test after head trauma because it detects fresh blood fast and reliably. The scan shows one moment. A hematoma can keep forming after that moment. A bleed that has not yet started, or has produced only a few millimeters of blood, can be invisible on a scan taken within an hour of the crash. Delayed bleeding is a particular concern in patients on anticoagulants and in older adults. In the subacute phase, roughly one to three weeks out, subdural blood can match the density of brain tissue on CT . That makes it easy to overlook. A normal first CT is reassuring, not final. New or worsening headache, confusion, drowsiness, vomiting, or weakness after a clear scan calls for repeat imaging. MRI is sometimes needed to show what CT cannot. ### Can you sleep after a head injury from a car accident? It depends on whether a physician has evaluated the patient. Before evaluation, drowsiness is itself a warning sign. A person who is hard to keep awake, vomiting, increasingly confused, or reporting a worsening headache belongs in an emergency room, not in bed. After a physician has examined the patient and reviewed a head CT, sleep is generally allowed and supports healing. The old instruction to keep a concussed person awake all night is no longer standard advice. Once a medical professional has evaluated the patient, rest, including sleep, is appropriate under CDC HEADS UP guidance . Discharge instructions typically ask that a responsible adult stay with the patient for the first 24 hours. The clinician may also give a specific wake-and-check schedule. Difficulty waking the person, or a change in behavior on waking, is an emergency at any hour. ### Does insurance cover traumatic brain injury treatment? The medical answer is that treatment for a brain bleed is decided by the scan and the neurologic exam, not by the patient's coverage. An emergency physician orders the head CT based on mechanism, symptoms, and risk factors. A neurosurgeon decides between observation and evacuation based on clot size, midline shift, and how alert the patient is. That care can include ICU monitoring, repeat imaging, surgery, and weeks or months of rehabilitation. The clinical need for each step is documented in the chart as it happens. Questions about who pays for that care are legal questions, and the firm's brain injury practice page addresses them. ### Can you have a brain bleed without hitting your head? Yes. Subdural hematomas in crashes often come from the brain moving inside the skull, not from the skull striking something. Sudden deceleration throws the brain forward and back. The bridging veins that run from the brain surface to the dura can tear from that motion alone. A patient can leave a collision with no cut, no bump, and no bruise and still have a subdural bleed forming. Tell EMS and the emergency physician how violent the stop was and whether the head snapped forward. Mention any period of dazed thinking or memory loss. That description shapes the decision to scan.